Noun

(en noun)

A protective head covering.

* {{quote-book, year=1963, author=(Margery Allingham)

, title=(The China Governess) , chapter=2 citation , passage=Now that she had rested and had fed from the luncheon tray Mrs. Broome had just removed, she had reverted to her normal gaiety.  She looked cool in a grey tailored cotton dress with a terracotta scarf and shoes and her hair a black silk helmet .}}

That which resembles a helmet in form, position, etc.

# The upper part of a chemist's retort.

# The hood-shaped upper sepal or petal of some flowers, as of the monkshood or the snapdragon.

# A naked shield or protuberance on the top or fore part of the head of a bird.

# (heraldry) The feature above a shield on a coat of arms.

Noun

(en noun)

(historical) A light helmet worn by infantrymen.

* 1590 , Edmund Spenser, The Faerie Queene , II.viii:

He stroke so hugely with his borrowd blade, / That it empierst the Pagans burganet , / And cleauing the hard steele, did deepe inuade / Into his head [...].